otelconf: refactor code to internal package

[codeboten]

There is no functional change here, only moving the code as the 1.0.0 version will be able to reuse this code in the common location.

Part of #8026

[codeboten]

Since there's no functional change i didn't think this needed a changelog

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.6%. Comparing base (e0f043f) to head (99b7d05).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
otelconf/internal/tls/config.go	83.3%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #8050     +/-   ##
=======================================
+ Coverage   78.5%   79.6%   +1.0%     
=======================================
  Files        185     186      +1     
  Lines      14760   11865   -2895     
=======================================
- Hits       11598    9452   -2146     
+ Misses      2808    2059    -749     
  Partials     354     354             

Files with missing lines	Coverage Δ
otelconf/v0.3.0/config.go	92.8% <ø> (+2.9%)	⬆️
otelconf/v0.3.0/log.go	97.6% <100.0%> (+0.1%)	⬆️
otelconf/v0.3.0/metric.go	89.7% <100.0%> (+0.3%)	⬆️
otelconf/v0.3.0/trace.go	99.4% <100.0%> (-0.2%)	⬇️
otelconf/internal/tls/config.go	83.3% <83.3%> (ø)

... and 176 files with indirect coverage changes

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